CN110727733A - Main and standby server system and data synchronization method - Google Patents
Main and standby server system and data synchronization method Download PDFInfo
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- CN110727733A CN110727733A CN201910912400.2A CN201910912400A CN110727733A CN 110727733 A CN110727733 A CN 110727733A CN 201910912400 A CN201910912400 A CN 201910912400A CN 110727733 A CN110727733 A CN 110727733A
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Abstract
The invention relates to a main and standby server system and a data synchronization method, belonging to the technical field of computer software. The temporary data tables are added in the main server and the standby server, the history storage service of the main server stores the stored history data into the local corresponding history data table, meanwhile, the data is written into the local temporary data table, the monitoring standby server periodically searches the temporary data table of the main server, synchronizes the data to the local history data table, and completes the synchronization of the history data between the main server and the standby server. Through the process, the invention can effectively solve the problems of network abnormality and inconsistent data of the main server and the standby server during switching, improves the reliability of data storage of the main server and the standby server, and ensures the normal operation of the main server and the standby server.
Description
Technical Field
The invention relates to a main and standby server system and a data synchronization method, belonging to the technical field of computer software.
Background
The monitoring system server of the transformer substation with the voltage level of 110kV or above adopts dual configuration and operates in a main-standby mode, the main server performs data calculation, data storage and alarm event generation, and the standby server operates in a hot standby mode, only performs data acquisition and does not perform service processing. When the main server is abnormal, the standby server is switched between the main server and the standby server, and is upgraded to the main server for service data processing, namely, the reliability of the function of the monitoring system is improved through dual redundancy configuration. When the dual configuration is operated, only the main server stores the historical data, and the standby server adopts a data synchronization mechanism to ensure the consistency of the historical data. In the actual operation process, when the main server and the standby server are abnormal or a main-standby switching event occurs, a signal loss event is easily caused due to an imperfect data synchronization mechanism, the historical data of the main server and the standby server are inconsistent, and the reliability of the historical data is reduced, so that the safe and stable operation of the transformer substation monitoring system is influenced. Therefore, the chinese patent application publication No. CN104239476A discloses a method, an apparatus, and a system for synchronizing a database, in which the scheme is provided with a synchronization apparatus independent from a primary database and a secondary database, the primary database sends a synchronization log of the database to the synchronization apparatus according to a synchronization request of the synchronization apparatus, the synchronization apparatus analyzes and captures data change information of the primary database, and the synchronization apparatus transmits the captured data change information to the secondary database, so as to synchronize primary and secondary data. Although the scheme can realize the data synchronization of the main and the standby, an additional synchronization device is needed, and whether the data changes or not needs to be judged in the synchronization process, so that the synchronization process is complex.
Disclosure of Invention
The invention aims to provide a main and standby server system and a data synchronization method, which aim to solve the problems that an additional synchronization device is required to be added in the data synchronization process of the main and standby servers at present, and the synchronization process is complex.
The present invention provides a data synchronization method for a host server and a standby server to solve the above technical problems, the data synchronization method comprising the following steps:
1) the main server adds the received data into an event processing queue, and writes the data in the queue into a historical data table and a temporary data table of the main server;
2) the standby server retrieves the temporary data table of the main server, synchronizes the data in the temporary data table to the historical data table of the standby server, and clears the synchronized data in the temporary data table of the main server;
3) the standby server checks whether an unprocessed event processing queue exists, if so, data in the event processing queue is written into a historical data table and a temporary data table of the standby server, the temporary data table of the standby server is used for being retrieved and updated by the main server, and the main server clears the synchronized data in the temporary data table of the standby server.
The temporary data tables are added in the main server and the standby server, the history storage service of the main server stores the stored history data into the local corresponding history data table, meanwhile, the data is written into the local temporary data table, the monitoring standby server periodically searches the temporary data table of the main server, synchronizes the data to the local history data table, and completes the synchronization of the history data between the main server and the standby server. Through the process, the invention can effectively solve the problems of network abnormality and inconsistent data of the main server and the standby server during switching, improves the reliability of data storage of the main server and the standby server, and ensures the normal operation of the main server and the standby server.
Further, in order to ensure that data can be reliably written into the temporary data table, before the main server writes the data into the temporary data table of the main server, the main server needs to judge whether the number of records in the temporary data table of the main server reaches an upper limit, if so, the data in the temporary data table needs to be saved as a local data cache file, the temporary data table needs to be emptied, and new data is written into the temporary data table.
Further, in order to timely synchronize the local data cache file to the standby server, when the main server checks that the local data cache file exists, the main server judges whether the standby server database service is available, and if the standby server database service is available and the main server temporary data table is empty, the local data cache file is stored in the main server temporary data table for retrieval and synchronization of the standby server.
Further, when the main server and the standby server are switched, the switched main server starts data receiving and processes the data according to the step 1).
Further, in order to ensure that the local data cache which is not synchronized to the original standby server in the original main server can be synchronously updated in time after the main server and the standby server are switched, the method further comprises the steps that the standby server judges whether a local data cache file exists or not, if the local data cache file exists, the cache file is stored in a temporary data table of the standby server, the main server searches the temporary data table of the standby server, synchronizes the data in the temporary data table of the standby server to a local historical data table of the main server, and the synchronized data in the temporary data table of the standby server are removed.
Further, when the communication between the main server and the standby server is disconnected, the main server and the standby server operate in a double-main mode, and the main server and the standby server respectively update the local historical data table and the temporary data table and synchronize with each other when the communication is recovered.
Further, before the main server adds the received data into the event processing queue, the received data is subjected to structuring processing.
Further, the historical data tables and the temporary data tables arranged in the main Server and the standby Server adopt a database technology of MYSQL, SQL Server or PG.
The invention also provides a main and standby server system, which comprises a main server and a standby server, wherein both the main server and the standby server are provided with a historical data table and a temporary data table, and the data synchronization method is executed.
The temporary data tables are added in the main server and the standby server, the history storage service of the main server stores the stored history data into the local history data table and writes the data into the local temporary data table, the monitoring standby server periodically retrieves the temporary data table of the main server and synchronizes the data to the local history data table, and the synchronization of the history data between the main server and the standby server is completed. Through the process, the invention can effectively solve the problems of network abnormality and inconsistent data of the main server and the standby server during switching, improves the reliability of data storage of the main server and the standby server, and ensures the normal operation of the main server and the standby server.
Drawings
FIG. 1 is a schematic diagram of data synchronization between a primary server and a standby server in an embodiment of the present invention;
FIG. 2 is a flow chart of host server data preprocessing in an embodiment of the present invention;
FIG. 3 is a flow chart of host server data processing in an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a process of unloading a data file from a host server according to an embodiment of the present invention;
FIG. 5 is a flow chart of host server temporary data table processing in an embodiment of the present invention;
fig. 6 is a flow chart of data processing of the standby server in the embodiment of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
Data synchronization method embodiment
The invention provides a data synchronization method of a main server and a standby server aiming at data synchronization between the main server and the standby server, and the method can be suitable for data synchronization between the main monitoring server and the standby monitoring server of a transformer substation and also can be suitable for data synchronization between other main servers and other standby servers. The data synchronization method of the present invention is described in detail below by taking the primary and backup monitoring servers of the transformer substation as examples.
As shown in fig. 1, when the monitoring system main server and the monitoring system standby server create the history database, a temporary data table is additionally created in addition to the history data table, and is used as a medium for synchronizing the history data. The monitoring system main server stores historical data generated in the running process of various systems such as alarm events, remote measurement sampling, electricity measurement, operation events and the like of the monitoring system into a local historical database table, and simultaneously writes the stored data into a local temporary data table. The monitoring system is characterized in that the backup server runs in a hot standby mode without processing service data, the historical storage service of the backup server is monitored without storing the service data, and the historical data storage of the backup server is realized by periodically retrieving and updating the temporary data table record of the main server, namely, the consistency of the historical data of the two servers is ensured by data synchronization. The specific data synchronization process is as follows.
1. Historical databases are created in a main server and a standby server of the monitoring system, the historical databases are respectively provided with a corresponding historical data table and a temporary data table tmpsqltable, the temporary data tables are used as media for synchronizing the historical data of the double sets of servers, and the storage structure of the temporary data tables is shown in table 1.
TABLE 1
| Serial number | Name of field | Data type | Description of the invention |
| 1 | ID | int | Recording index numbers |
| 2 | SQLSTR | varchar | SQL statement |
| 3 | DATETIME | double | Time of day |
2. The process flow of monitoring the primary server is as follows.
1) The monitoring main server history storage service preprocesses system operation information such as event alarm, remote measurement sampling, operation control and the like, organizes various operation information into structured data and then adds the structured data into a history storage service data processing queue, as shown in fig. 2.
2) The monitoring main server periodically takes out data from the data queue in batches and stores the data into a local historical database. Meanwhile, the extracted data is stored in a local temporary data table, the size of the general temporary data table is limited, the size of the local temporary data table is set according to needs, in order to ensure that the extracted data can be smoothly stored in the temporary data table, the storage condition in the temporary data table tmpsql table needs to be judged before storage, whether the number of records in the temporary data table exceeds a preset limit value (the preset limit value is 1 ten thousand by default and can be modified) is judged, if the number of records in the temporary data table does not exceed the preset limit value, the historical data is organized into SQL statements and written into the temporary data table tmpqltable table for synchronous use of a standby server, if the number of records in the temporary data table tmpqltable table exceeds the preset limit value, the standby server is considered to be insufficient in data processing capacity or in an abnormal state, in order to prevent system bottleneck from being generated when the standby server processes due to excessive number of entries in the temporary data table, for example, an operation system card is caused by long-time high-frequency disk occupation, and at the moment, the, and emptying the tmpsql table and writing the new history data into the tmpsql table, as shown in fig. 3.
3) The main server periodically checks whether the database service of the standby server is available, if the database service of the standby server is available, whether a local data cache file exists is checked, if the local data cache file exists, whether the local temporary data table is empty is detected, and when the local data cache file is empty, one local data cache file is updated to the temporary data table for the synchronization of the standby server.
4) And the main server periodically searches whether the data exist in the temporary data table of the standby server, if so, the data exist and need to be synchronized, the data in the temporary data table of the standby server are updated to the local historical data table, and the updated data in the temporary data table of the standby server are deleted.
3. And (5) the working process of the standby server.
1) The standby server periodically searches whether data exist in the temporary data table of the main server, if so, the data in the temporary data table of the main server are updated to the local historical data table of the standby server, and the updated data in the temporary data table of the main server are deleted, so that the synchronization of the historical data of the main server and the historical data of the standby server is completed, as shown in fig. 6.
2) Since the standby server may be switched from the previous primary server, and there may be a data processing queue that is not stored in the local history data table and the temporary data table in the standby server (the original primary server), the standby server needs to periodically search the data processing queue, determine whether there is unprocessed data, and perform a write operation if there is unprocessed data, that is, write the data in the queue into the local history data table and the temporary data table, as shown in fig. 3.
Meanwhile, a local data cache file may exist in the standby server (original main server), so that the standby server needs to retrieve the local data cache file, and if the local data cache file exists and the temporary data table of the standby server is empty, the local data cache file is stored in the temporary data table of the standby server for synchronous use by the main server.
When the master and standby roles of the master and standby servers are switched, the new master server performs processing according to the working flow of step 3, the new standby server performs processing according to the flow of step 3, and when the data in the data queue of the new standby server is finished, the processing continues according to the flow shown in fig. 4.
When the network disconnection occurs between the master server and the standby server, the master server and the standby server operate in a dual-master mode, each of the master server and the standby server further updates the local historical data table and the temporary data table, and after the network is recovered, the local historical data table and the temporary data table are mutually synchronized according to the flow shown in fig. 5 and 6, so that the data consistency of the two servers is ensured.
Embodiment of Main/Standby Server System
The main server and the standby server realize data synchronization based on the temporary data table, and the synchronization process is described in detail in the embodiment of the data synchronization method, and is not described again.
Claims (9)
1. A data synchronization method of a main server and a standby server is characterized in that both the main server and the standby server are provided with a history data table and a temporary data table, and the data synchronization method comprises the following steps:
1) the main server adds the received data into an event processing queue, and writes the data in the queue into a historical data table and a temporary data table of the main server;
2) the standby server retrieves the temporary data table of the main server, synchronizes the data in the temporary data table to the historical data table of the standby server, and clears the synchronized data in the temporary data table of the main server;
3) the standby server checks whether an unprocessed event processing queue exists, if so, data in the event processing queue is written into a historical data table and a temporary data table of the standby server, the temporary data table of the standby server is used for being retrieved and updated by the main server, and the main server clears the synchronized data in the temporary data table of the standby server.
2. The data synchronization method of the active and standby servers according to claim 1, wherein before writing data into the temporary data table of the main server, the main server needs to determine whether the number of records in the temporary data table of the main server reaches an upper limit, and if so, the data in the temporary data table needs to be transferred to a local data cache file, and the temporary data table is emptied and new data is written into the temporary data table.
3. The data synchronization method of the active and standby servers according to claim 2, wherein when the primary server checks that the local data cache file exists, the primary server determines whether the database service of the standby server is available, and if the database service of the standby server is available and the temporary data table of the primary server is empty, the local data cache file is stored in the temporary data table of the primary server for retrieval and synchronization of the standby server.
4. The data synchronization method for the main server and the standby server according to any one of claims 1 to 3, wherein when the main server and the standby server are switched, the switched main server starts data reception and processes the data according to step 1).
5. The data synchronization method of the active and standby servers according to claim 4, further comprising the step of the standby server determining whether a local data cache file exists, if so, storing the cache file in a temporary data table of the standby server, retrieving the temporary data table of the standby server by the main server, synchronizing the data in the temporary data table to a local historical data table of the main server, and clearing the synchronized data in the temporary data table of the standby server.
6. The data synchronization method for active and standby servers according to any one of claims 1 to 3, wherein when the communication between the active and standby servers is disconnected, the active and standby servers operate in a dual-master mode, and the active and standby servers respectively update the local history data table and the temporary data table and perform mutual synchronization when the communication is restored.
7. The method according to claim 1, wherein the primary server performs a structuring process on the received data before adding the received data to the event processing queue.
8. The data synchronization method for the active and standby servers according to claim 1, wherein the historical data tables and the temporary data tables set in the active and standby servers adopt a database technology of MYSQL, SQL Server or PG.
9. A master-standby server system, comprising a master server and a standby server, wherein the master server and the standby server are both provided with a history data table and a temporary data table, and execute the data synchronization method according to any one of claims 1 to 8.
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| CN110727733B (en) | 2023-07-14 |
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